TECH TIPS FOR COLD WEATHER
To Avoid Power Drain
Switch to manual focus if using a auto focus camera.
Lithium batteries generate better power below 20º F.
Carry batteries in zip-loc bags next to body to stay warm.
Electronic accessories are not tolerant of cold. Keepm warm or leavem behind.
Small iron oxide heating packets can be taped battery compartment
Do not rapid fire flash units. Cold weather zaps the batteries intinally. Rapid firing before the capacitors are fully recharged will shorten the battery life even further.
Optional remote battery packs can help but are expensive.
Lens Fogging
Set the lens in the sun to facilitate fog reduction.
When bringing a cold camera inside, have it in a zip-loc bag with the air removed. The moisture will condense on the outside of the bag.
Dont exhale on your cameras eyepiece or hold you your eye for any length of time.
A compact waterproof camera that will operate without batteries makes a great backup.
Silica gel packs can help prevent condensation inside waterproof bags.
In Severe Cold
Velcro closures on camera equipment aid in quick access.
Plastic camera parts are easier on the hands than metal.
Take the extra time to keep your hands warm, it is easier than trying to thaw them.
Dont place your gloves in the snow while you take pictures. They take longer to rewarm than if you kept them on your person.
Should you freeze against camera metal and/or lens glass, the parts must be actively warmed. Insulation alone will not get the blood flowing.
Fingerless gloves can be useful, but....Be alert to frostbite - thats when your fingers stop hurting from the cold.
Film starts to become brittle at -20º F, advance frames slowly to avoid tearing of the sprocket holes.
Hot spices in your diet dilate blood and help keep your extremities warm.
Tips condensed from Backpacker Magazine - October 1994